ICD-10-CM · Billable Code
N63.21 — Unspecified lump in the left breast, upper outer quadrant
Chapter N00-N99: Diseases of the genitourinary system
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N63.20Unspecified lump in the left breast, unspecified quadrantN63.22Unspecified lump in the left breast, upper inner quadrantN63.23Unspecified lump in the left breast, lower outer quadrantN63.24Unspecified lump in the left breast, lower inner quadrantN63.25Unspecified lump in the left breast, overlapping quadrants
Common questions about N63.21 (Unspecified lump in the left breast, upper outer quadrant)
What does ICD-10 code N63.21 mean?
N63.21 is the ICD-10-CM 2025 code for Unspecified lump in the left breast, upper outer quadrant. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is N63.21 a billable diagnosis code?
Yes, N63.21 is a billable / specific ICD-10-CM code, meaning it can be used by clinicians and hospitals as a primary or secondary diagnosis on claims and electronic health records.
Which ICD-10 chapter does N63.21 belong to?
N63.21 belongs to the chapter "Diseases of the genitourinary system" (codes N00-N99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Unspecified lump in the left breast, upper outer quadrant?
For a plain-language explanation of Unspecified lump in the left breast, upper outer quadrant, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Unspecified lump in the left breast, upper outer quadrant" above to get a personalised answer.
Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗